In assembling
the turbine finally, these, after being soaked in oil, should be inserted
between the ring and the discs. Put in four screws only at first, and get
the ring properly centred and the bearings exactly in line, which will be
shown by the spindle revolving easily. Then tighten up the nuts and insert
the other bolts, the three lowest of which are passed through the feet.
Affix the pulley and stirrup, and adjust the spindle longitudinally until
the rotor just does not rub the casing. The soldering on of the cap of A
completes operations.
To get efficiency, heavy gearing down is needed, and this can be managed
easily enough with the help of a clockwork train, decreasing the speed five
or more times for driving a dynamo, and much more still for slow work, such
as pumping.
A More Elaborate Turbine.
[Illustration: FIG. 70.--Vertical section of steam turbine with formed
blades (left); outside view of turbine, gear side (right).]
The turbine just described can hardly be termed an efficient one, as the
vanes, owing to their simple formation, are not shaped to give good
results.
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